US12598861B2ActiveUtilityA1

Display panels

69
Assignee: WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECH CO LTDPriority: Jun 30, 2023Filed: Jul 18, 2023Granted: Apr 7, 2026
Est. expiryJun 30, 2043(~17 yrs left)· nominal 20-yr term from priority
Inventors:WANG HAORAN
H10K 2102/351H10K 2101/40H10K 50/17H10K 50/00H10K 2101/30H10K 50/11H10K 50/15H10K 59/12H10K 59/35H10K 50/156H10K 50/18
69
PatentIndex Score
0
Cited by
7
References
20
Claims

Abstract

Embodiments of the present disclosure provide a display panel, in which a hole control layer is disposed on a hole transport layer, a light-emitting material layer is disposed on the hole control layer, and the hole control layer includes a first sub-hole control layer and a second sub-hole control layer. An energy difference between a HOMO energy level of the first sub-hole control layer and a HOMO energy level of the second sub-hole control layer is greater than or equal to 0.2 eV, and the HOMO energy level of the second sub-hole control layer is greater than a HOMO energy level of the light-emitting material layer and less than a HOMO energy level of the hole transport layer.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A display panel, comprising:
 a first electrode;   a hole transport layer disposed on the first electrode;   a hole control layer disposed on the hole transport layer;   a light-emitting material layer disposed on the hole control layer; and   a second electrode disposed on the light-emitting material layer;   wherein the hole control layer comprises a first sub-hole control layer and a second sub-hole control layer, a thickness of the first sub-hole control layer is less than a thickness of the second sub-hole control layer, an energy difference between a HOMO energy level of the first sub-hole control layer and a HOMO energy level of the second sub-hole control layer is greater than or equal to 0.2 eV, and   the HOMO energy level of the second sub-hole control layer is greater than a HOMO energy level of the light-emitting material layer and less than a HOMO energy level of the hole transport layer.   
     
     
         2 . The display panel of  claim 1 , wherein a hole mobility of the first sub-hole control layer is less than a hole mobility of the second sub-hole control layer. 
     
     
         3 . The display panel of  claim 2 , wherein a ratio of the hole mobility of the first sub-hole control layer to the hole mobility of the second sub-hole control layer is less than or equal to 0.8. 
     
     
         4 . The display panel of  claim 1 , wherein the first sub-hole control layer is disposed between the hole transport layer and the second sub-hole control layer. 
     
     
         5 . The display panel of  claim 4 , wherein the HOMO energy level of the first sub-hole control layer is greater than the HOMO energy level of the light-emitting material layer and less than the HOMO energy level of the second sub-hole control layer; and
 a LUMO energy level of the first sub-hole control layer is greater than a LUMO energy level of the light-emitting material layer, and less than a LUMO energy level of the second sub-hole control layer and a LUMO energy level of the hole transport layer.   
     
     
         6 . The display panel of  claim 4 , wherein the HOMO energy level of the first sub-hole control layer is greater than the HOMO energy level of the hole transport layer; and
 a LUMO energy level of the first sub-hole control layer is greater than a LUMO energy level of the light-emitting material layer, a LUMO energy level of the second sub-hole control layer, and a LUMO energy level of the hole transport layer.   
     
     
         7 . The display panel of  claim 1 , wherein the first sub-hole control layer is disposed between the second sub-hole control layer and the light-emitting material layer. 
     
     
         8 . The display panel of  claim 7 , wherein the HOMO energy level of the first sub-hole control layer is greater than the HOMO energy level of the second sub-hole control layer and less than the HOMO energy level of the hole transport layer; and
 a LUMO energy level of the first sub-hole control layer is greater than a LUMO energy level of the light-emitting material layer and less than a LUMO energy level of the hole transport layer.   
     
     
         9 . The display panel of  claim 7 , wherein the HOMO energy level of the first sub-hole control layer is less than the HOMO energy level of the light-emitting material layer; and
 a LUMO energy level of the first sub-hole control layer is greater than a LUMO energy level of the light-emitting material layer and less than a LUMO energy level of the hole transport layer.   
     
     
         10 . The display panel of  claim 8 , wherein the LUMO energy level of the first sub-hole control layer is equal to a LUMO energy level of the second sub-hole control layer. 
     
     
         11 . The display panel of  claim 9 , wherein the LUMO energy level of the first sub-hole control layer is equal to a LUMO energy level of the second sub-hole control layer. 
     
     
         12 . The display panel of  claim 1 , wherein the thickness of the first sub-hole control layer ranges from 3 nanometers to 10 nanometers. 
     
     
         13 . The display panel of  claim 1 , wherein a LUMO energy level of the second sub-hole control layer is greater than a LUMO energy level of the light-emitting material layer and less than a LUMO energy level of the hole transport layer; and
 an energy difference between the LUMO energy level of the second sub-hole control layer and the LUMO energy level of the light-emitting material layer is greater than or equal to 0.2 eV.   
     
     
         14 . A display panel, comprising:
 a first electrode;   a hole transport layer disposed on the first electrode;   a hole control layer disposed on the hole transport layer;   a light-emitting material layer disposed on the hole control layer; and   a second electrode disposed on the light-emitting material layer;   wherein the hole control layer comprises a first sub-hole control layer and a second sub-hole control layer, a thickness of the first sub-hole control layer is less than a thickness of the second sub-hole control layer, an energy difference between a HOMO energy level of the first sub-hole control layer and a HOMO energy level of the second sub-hole control layer is greater than or equal to 0.2 eV, and the HOMO energy level of the second sub-hole control layer is greater than a HOMO energy level of the light-emitting material layer and less than a HOMO energy level of the hole transport layer;   a LUMO energy level of the second sub-hole control layer is greater than a LUMO energy level of the light-emitting material layer and less than a LUMO energy level of the hole transport layer, and an energy difference between the LUMO energy level of the second sub-hole control layer and the LUMO energy level of the light-emitting material layer is greater than or equal to 0.2 eV; and   a hole mobility of the first sub-hole control layer is less than a hole mobility of the second sub-hole control layer.   
     
     
         15 . The display panel of  claim 14 , wherein a ratio of the hole mobility of the first sub-hole control layer to the hole mobility of the second sub-hole control layer is less than or equal to 0.8. 
     
     
         16 . The display panel of  claim 14 , wherein the first sub-hole control layer is disposed between the second sub-hole control layer and the light-emitting material layer. 
     
     
         17 . The display panel of  claim 16 , wherein the HOMO energy level of the first sub-hole control layer is greater than the HOMO energy level of the second sub-hole control layer and less than the HOMO energy level of the hole transport layer; and
 a LUMO energy level of the first sub-hole control layer is greater than the LUMO energy level of the light-emitting material layer and less than the LUMO energy level of the hole transport layer.   
     
     
         18 . The display panel of  claim 16 , wherein the HOMO energy level of the first sub-hole control layer is less than the HOMO energy level of the light-emitting material layer; and
 a LUMO energy level of the first sub-hole control layer is greater than the LUMO energy level of the light-emitting material layer and less than the LUMO energy level of the hole transport layer.   
     
     
         19 . The display panel of  claim 14 , wherein a LUMO energy level of the first sub-hole control layer is equal to the LUMO energy level of the second sub-hole control layer. 
     
     
         20 . The display panel of  claim 14 , wherein the thickness of the first sub-hole control layer ranges from 3 nanometers to 10 nanometers.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.